Fuselage

(Click on photo to enlarge)

This could be the way to go. Only 4 stringers with simple shape 4 piece bulkheads (riveted to rectangle). Frontend is the firewall, rearend carries the rudderspar.

Aluminum angles (1,5x3/16") should be bent at 2 stages as shown. These bends in the stringers are stiffend with Alu plates - bolted in place with countersunk bolts (AN3). The bends are necessary due to spar fixture (in this area the stringers should be parallel) and cockpit shoulder width (est. 60cm/23,5").